Spatial partitioning and asymmetric hybridization among sympatric coastal steelhead trout (<i>Oncorhynchus mykiss irideus</i>), coastal cutthroat trout (<i>O. clarki clarki</i>) and interspecific hybrids

Ostberg, Carl O.; Slatton, Stacey L.; Rodriguez, Russell J.

doi:10.1111/j.1365-294x.2004.02268.x

Cited by 49 publications

(44 citation statements)

References 97 publications

(203 reference statements)

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“…These upstream–downstream differences are common to virtually every study of introgression between cutthroat trout and rainbow trout (e.g., Ostberg et al. 2004; Gunnell et al. 2008; Rasmussen et al.…”

Section: Discussionmentioning

confidence: 99%

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Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

McKelvey

Young

Wilcox

et al. 2016

Ecology and Evolution

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Introgressive hybridization between native and introduced species is a growing conservation concern. For native cutthroat trout and introduced rainbow trout in western North America, this process is thought to lead to the formation of hybrid swarms and the loss of monophyletic evolutionary lineages. Previous studies of this phenomenon, however, indicated that hybrid swarms were rare except when native and introduced forms of cutthroat trout co‐occurred. We used a panel of 86 diagnostic, single nucleotide polymorphisms to evaluate the genetic composition of 3865 fish captured in 188 locations on 129 streams distributed across western Montana and northern Idaho. Although introgression was common and only 37% of the sites were occupied solely by parental westslope cutthroat trout, levels of hybridization were generally low. Of the 188 sites sampled, 73% contained ≤5% rainbow trout alleles and 58% had ≤1% rainbow trout alleles. Overall, 72% of specimens were nonadmixed westslope cutthroat trout, and an additional 3.5% were nonadmixed rainbow trout. Samples from seven sites met our criteria for hybrid swarms, that is, an absence of nonadmixed individuals and a random distribution of alleles within the sample; most (6/7) were associated with introgression by Yellowstone cutthroat trout. In streams with multiple sites, upstream locations exhibited less introgression than downstream locations. We conclude that although the widespread introduction of nonnative trout within the historical range of westslope cutthroat trout has increased the incidence of introgression, sites containing nonadmixed populations of this taxon are common and broadly distributed.

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Section: Discussionmentioning

confidence: 99%

“…In addition, there are often upstream–downstream differences in the prevalence of introgression, regardless of whether rainbow trout are indigenous to a basin (Ostberg et al. 2004; Gunnell et al. 2008).…”

Section: Introductionmentioning

confidence: 99%

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

McKelvey

Young

Wilcox

et al. 2016

Ecology and Evolution

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“…[60][61][62]). To explore how asymmetrical migration could influence our results, we varied asymmetry in migration rates (S6 Text).…”

Section: Simulations Of Hybrid Populations With Ongoing Migrationmentioning

confidence: 99%

Reproductive isolation of hybrid populations driven by genetic incompatibilities

Schumer

Cui

Rosenthal

et al. 2014

Preprint

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Despite its role in homogenizing populations, hybridization has also been proposed as a means to generate new species. The conceptual basis for this idea is that hybridization can result in novel phenotypes through recombination between the parental genomes, allowing a hybrid population to occupy ecological niches unavailable to parental species. Here we present an alternative model of the evolution of reproductive isolation in hybrid populations that occurs as a simple consequence of selection against genetic incompatibilities. Unlike previous models of hybrid speciation, our model does not incorporate inbreeding, or assume that hybrids have an ecological or reproductive fitness advantage relative to parental populations. We show that reproductive isolation between hybrids and parental species can evolve frequently and rapidly under this model, even in the presence of substantial ongoing immigration from parental species and strong selection against hybrids. An interesting prediction of our model is that replicate hybrid populations formed from the same pair of parental species can evolve reproductive isolation from each other. This non-adaptive process can therefore generate patterns of species diversity and relatedness that resemble an adaptive radiation. Intriguingly, several known hybrid species exhibit patterns of reproductive isolation consistent with the predictions of our model. Author SummaryUnderstanding the origin of species is one of the central challenges in evolutionary biology. It has been suggested that hybridization could generate new species because hybrids can display novel combinations of traits that induce reproductive isolation from their parental species (called "hybrid speciation"). Existing models predict that this should only occur in special cases, and indeed there have been only few well-supported examples. We describe a new model of hybrid reproductive isolation that results from selection against genetic incompatibilities in hybrids, which are predicted to be common. Simulations reveal that hybrid populations rapidly and frequently become isolated from parental species by fixing combinations of genes that hinder successful reproduction with parental species.

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“…In many cases hybridization has been an important part of evolution that promotes incorporation of new genes from one population to another and in several cases has been shown to be a step in the process leading to speciation (Templeton 1981;Mantovani et al 1996;Parris et al 2001). The stability of hybrid zones is very often attributed to a balance between dispersal of parental individuals into the zone and selection against hybrids (Barton and Hewitt 1985;Szymura and Barton 1986;Ostberg et al 2004). …”

Section: Introductionmentioning

confidence: 99%

A Study of Canalization and Developmental Stability in the Sternopleural Bristle System of Drosophila Melanogaster

Dworkin

2005

Evolution

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Among the explanations for minimizing the effects of extraneous variation has been canalization and developmental stability. However, there is little agreement as to whether these two processes reflect a common set of mechanisms. This confusion is inflated due to the lack of consensus as to a precise definition of canalization. In this study, canalization in the sternopleural bristle system is used to investigate the relationships between measures of canalization and developmental stability by compring how a panel of naturally derived lines responds to both genetic and environmental perturbations. No evidence for a common mechanism between the different measures of canalization was observed. Furthermore, a hypothesis regarding a common mechanism for environmental and genetic canalization was tested, and no evidence was found to support it. However, there is evidence for a relationship between at least one form of canalization and development stability.

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Spatial partitioning and asymmetric hybridization among sympatric coastal steelhead trout (Oncorhynchus mykiss irideus), coastal cutthroat trout (O. clarki clarki) and interspecific hybrids

Cited by 49 publications

References 97 publications

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams

Reproductive isolation of hybrid populations driven by genetic incompatibilities

A Study of Canalization and Developmental Stability in the Sternopleural Bristle System of Drosophila Melanogaster

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